The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 21, 2017
Filed:
Aug. 29, 2012
Georg Friedrich Gaertner, Aachen, DE;
Horst Greiner, Aachen, DE;
Hans-peter Loebl, Monschau-Imgenbroich, DE;
Gerardus Henricus Rietjens, Stramproy, NL;
Georg Friedrich Gaertner, Aachen, DE;
Horst Greiner, Aachen, DE;
Hans-Peter Loebl, Monschau-Imgenbroich, DE;
Gerardus Henricus Rietjens, Stramproy, NL;
OLEDWORKS GMBH, Aachen, DE;
Abstract
The invention relates to a light source () comprising a light generating unit () like an organic light emitting diode and an outcoupling device () for coupling light out of the light generating unit in an outcoupling direction (). The outcoupling device comprises a first region () for facing the light generating unit, a second region () having a refractive index being smaller than the refractive index of the first region, and a structured intermediate region () between the first region and the second region. The first region is optically homogenous and has a thickness in the outcoupling direction being larger than a coherence length of the light, thereby reducing generally possible wavelength dependent interference effects and, thus, a corresponding degradation of the outcoupling efficiency. The outcoupling efficiency can therefore be increased.